Using Armourer's Workshop 0.50.1.596, any time I enter a swimming animation, Armourer's Workshop custom renders disappear from the model. I suspect that is because it is rendering its own copy of the model as opposed to rotating the existing one.

This may be related to the fact the mod does the stupid thing of replacing a core minecraft class. We are working on a rework for that right now, so it may be fixed in the coming week

Should be fixed in the latest commit, if you find any other issue with the mod please let me know

The use of Obfuscate is a known incompatibility with Armourer's Workshop. while the armor will render fine, reskinned items will not show up in third person renders. This is almost heart breaking news.

Its the best I can do, and at that point that should be on the creator of Armourer's Workshop to fix tbh

Fair enough. Risky has stated there is nothing he can do to make item rendering work on his end, and I simply don't know enough about rendering pipelines to check myself.